How DNA Relationship Testing Works

DNA relationship testing is a powerful, science-based method for confirming biological connections between individuals. Whether you're verifying paternity, exploring sibling relationships, or seeking clarity through grandparent or avuncular (aunt/uncle) testing, AssureDNA uses cutting-edge genetic analysis to deliver clear, accurate answers.

What Is DNA and Why Is It Important?

DNA (Deoxyribonucleic Acid) is the genetic blueprint found in nearly every cell of the human body. It contains the hereditary instructions passed from parents to children. Half of a child’s DNA comes from the biological mother, and the other half from the biological father. This makes DNA an ideal tool for verifying biological relationships.

The Testing Process: Step by Step

1Sample Collection (Painless and Non-Invasive)

We use a simple cheek (buccal) swab to collect cells from inside the mouth. This process is quick, painless, and can be done at home using one of our discreet self-sampling kits.

2Laboratory Analysis

Once the samples are returned to our UKAS-accredited laboratory, our team of genetic scientists extracts the DNA and analyses 25 short tandem repeat (STR) markers. These markers are highly variable among individuals and are the industry standard for relationship testing.

3Genetic Comparison

In paternity testing, for example, we look for a match across all 25 markers between the child and alleged father. In sibling, grandparent, or aunt/uncle testing, we use advanced statistical models (such as likelihood ratios) to calculate the probability of a biological relationship.

4Result Interpretation

A 99.99% or higher match typically confirms a biological relationship.
A 0% match definitively excludes a relationship.
For complex cases (e.g. half-siblings or cousins), results may include a probability score supported by scientific context.

Accuracy and Confidentiality

All testing is carried out in a secure, ISO 17025–accredited laboratory. We follow strict chain-of-custody procedures for legal cases and maintain full compliance with UK data protection laws. Your samples and results remain confidential, and are never shared without your explicit consent.

Legal vs Peace-of-Mind Testing

At AssureDNA, we offer both:

Peace-of-mind DNA tests – for private knowledge, done entirely at home.
Legal DNA tests – which follow a witnessed sample collection process and are admissible in UK courts.

What You Receive

Discreetly packaged at-home testing kit
Step-by-step instructions
Consent forms for each participant
Free return envelope
Expert support at every stage
Results within 1 working day of sample arrival

Why Choose AssureDNA?

Over 99.99% accuracy
UKAS & ISO-accredited laboratory
Fast turnaround (results the next working day)
Dedicated customer support
Fully confidential and compliant with the Human Tissue Act

What our customers say

Frequently asked questions

What is a DNA relationship test?

A DNA relationship test is a scientific method used to confirm biological relationships such as paternity, maternity, or sibling connections. It compares DNA markers between individuals to assess the probability of a biological match.

How are DNA samples collected for testing?

DNA samples are collected using a painless cheek swab. Each person gently rubs the swab inside their mouth to gather cells, which are then sent to a laboratory for analysis.

What happens to the DNA samples in the lab?

In the lab, DNA is extracted from the cheek cells and analysed using 25 short tandem repeat (STR) markers. These are compared between individuals to assess genetic relationships with high accuracy.

Are DNA test results accurate?

Yes, DNA test results are highly accurate. At AssureDNA, our accredited laboratory uses 25-marker testing to confirm or exclude relationships with over 99.99% certainty in most cases.

Will my DNA test results be confidential?

Yes, all DNA test results are handled in strict confidence. AssureDNA complies fully with UK data protection laws and never shares your information without consent.